Slider Navigation Boundaries

April 14, 2025 · AI Conversations

User
if ($('.overlay-slider-grid').length) {
const $overlaySliderGrid = $('.overlay-slider-grid');
const $overlayslider = $('.overlay-slider');
const $mainparent = $overlaySliderGrid.find('.content-overlayslider');
const $hoverItems = $mainparent.find('.hover-item');

let currentIndex = 0; // For tracking the selected item for keyboard navigation or scroll
let xPos = 0; // Initialize xPos
let yPos = 0; // Initialize yPos

// Function to update background and content
const updateSlider = ($item) => {
const newBg = $item.data('bg');
$overlayslider.css('background-image', `url(${newBg})`);

$item.find('.content').addClass('active');
$item.find('.description').addClass('active');
$item.siblings().find('.content, .description').removeClass('active');
};

// Scroll event for hover items (mouse wheel)
$hoverItems.on('wheel', function (e) {
e.preventDefault(); // Prevent default scroll behavior
const delta = e.originalEvent.deltaY;

if (delta > 0) { // Scroll Down
currentIndex = (currentIndex + 1) % $hoverItems.length;
} else if (delta < 0) { // Scroll Up
currentIndex = (currentIndex – 1 + $hoverItems.length) % $hoverItems.length;
}

updateSlider($hoverItems.eq(currentIndex));
});

// Keyboard navigation (up/down arrow keys)
$(document).on('keydown', function (e) {
if (e.key === 'ArrowUp') {
currentIndex = (currentIndex – 1 + $hoverItems.length) % $hoverItems.length;
updateSlider($hoverItems.eq(currentIndex));
} else if (e.key === 'ArrowDown') {
currentIndex = (currentIndex + 1) % $hoverItems.length;
updateSlider($hoverItems.eq(currentIndex));
}
});

// Intersection Observer to detect visibility of the overlay-slider-grid
const observerOptions = {
root: null,
rootMargin: '0px',
threshold: 0.5
};

const observer = new IntersectionObserver((entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
$mainparent.addClass('visible');
$hoverItems.eq(currentIndex).trigger('wheel'); // Trigger initial update
} else {
$mainparent.removeClass('visible');
}
});
}, observerOptions);

observer.observe($overlaySliderGrid[0]);

// Browser scrollbar event to update content
$(window).on('scroll', function () {
const scrollTop = $(window).scrollTop();
const overlayOffset = $overlaySliderGrid.offset().top;
const overlayHeight = $overlaySliderGrid.outerHeight();

if (scrollTop >= overlayOffset && scrollTop

Assistant
To **prevent looping** back to the first item after the last one **and allow default browser scroll behavior when slides are finished**, you can slightly adjust your `wheel` and `keydown` logic.

Here’s the modified part of your code with that logic added:

—

### ✅ **Updated Wheel Scroll + Key Navigation with Boundaries**

$hoverItems.on('wheel', function (e) {
    const delta = e.originalEvent.deltaY;

    if (delta > 0) { // Scroll Down
        if (currentIndex < $hoverItems.length - 1) {
            e.preventDefault(); // Only prevent scroll if we can move
            currentIndex++;
            updateSlider($hoverItems.eq(currentIndex));
        } // else allow scroll
    } else if (delta < 0) { // Scroll Up
        if (currentIndex > 0) {
            e.preventDefault(); // Only prevent scroll if we can move
            currentIndex--;
            updateSlider($hoverItems.eq(currentIndex));
        } // else allow scroll
    }
});

—

### ✅ **Updated Keyboard Navigation (optional: same boundary logic)**

$(document).on('keydown', function (e) {
    if (e.key === 'ArrowUp') {
        if (currentIndex > 0) {
            currentIndex--;
            updateSlider($hoverItems.eq(currentIndex));
        }
    } else if (e.key === 'ArrowDown') {
        if (currentIndex < $hoverItems.length - 1) {
            currentIndex++;
            updateSlider($hoverItems.eq(currentIndex));
        }
    }
});

—

### 🔍 Summary of Changes

– The `wheel` event now:
– **Only prevents default** if scrolling within bounds.
– **Allows natural scroll** when first or last item is reached.
– Keyboard navigation will **not loop** either, respecting boundaries.

Let me know if you also want to **fade out** or **disable highlight effects** on the last slide or do something like "Show More" once the last slide appears!

Assistant
To prevent looping back to the first item when scrolling beyond the last slide (or before the first), and to **allow the browser's default scroll behavior once all slides are viewed**, you need to modify the `wheel` handler logic like this:

### ✅ Updated Code for the Scroll Event:
Replace the current `.on('wheel', …)` logic with the following:

$hoverItems.on('wheel', function (e) {
    const delta = e.originalEvent.deltaY;

    // Scroll Down
    if (delta > 0) {
        if (currentIndex < $hoverItems.length - 1) {
            e.preventDefault(); // Only prevent default if there's a next item
            currentIndex++;
            updateSlider($hoverItems.eq(currentIndex));
        }
        // Else allow browser to scroll
    }
    // Scroll Up
    else if (delta < 0) {
        if (currentIndex > 0) {
            e.preventDefault(); // Only prevent default if there's a previous item
            currentIndex--;
            updateSlider($hoverItems.eq(currentIndex));
        }
        // Else allow browser to scroll
    }
});

### 🧠 Explanation:
– This checks whether you're at the start or end of the slide list.
– It **only prevents the default scroll behavior when there's still a slide to move to**.
– When you reach the first or last slide, it stops intercepting the scroll and allows the browser to scroll the page normally.

Let me know if you'd also like to disable the scroll-to-slider behavior when it's not fully in view (based on `IntersectionObserver`) or any smoother UX enhancement!

Assistant
Got it — let’s fix both issues **step-by-step**:

—

### ✅ **Goal Recap**:
1. **Prevent loop**: Stop looping to the first slide after the last one, or to the last slide when scrolling up from the first.
2. **Allow browser scroll**: When the user scrolls beyond the last (or before the first) item, allow normal page scroll to continue.

—

### ✅ **Full Updated JavaScript Fix**:

Please **replace your current `.on('wheel')` handler** with this logic:

let scrollLock = false;

$mainparent.on('wheel', function (e) {
    const delta = e.originalEvent.deltaY;

    // Only act if the element is visible (via observer)
    if (!$mainparent.hasClass('visible') || scrollLock) return;

    if (delta > 0) {
        // Scroll Down
        if (currentIndex < $hoverItems.length - 1) {
            e.preventDefault();
            currentIndex++;
            updateSlider($hoverItems.eq(currentIndex));
        } else {
            // Unlock scroll so browser can scroll normally
            scrollLock = true;
        }
    } else {
        // Scroll Up
        if (currentIndex > 0) {
            e.preventDefault();
            currentIndex--;
            updateSlider($hoverItems.eq(currentIndex));
        } else {
            scrollLock = true;
        }
    }
});

// Reset scrollLock when outside the overlay-slider-grid
$(window).on('scroll', function () {
    const scrollTop = $(window).scrollTop();
    const overlayOffset = $overlaySliderGrid.offset().top;
    const overlayHeight = $overlaySliderGrid.outerHeight();

    if (scrollTop < overlayOffset || scrollTop > overlayOffset + overlayHeight) {
        scrollLock = false; // re-enable interaction
    }
});

—

### 🧠 How This Works:
– `scrollLock` prevents the slider from capturing more scroll events once you reach an end.
– Browser scroll is allowed once you're at the start or end of the slider.
– It auto-resets when you're outside the `.overlay-slider-grid` section.

—

### 💡 Pro Tip:
You may also want to **limit rapid scrolling** using a throttle or timeout. Let me know if you want that added too.

Would you like me to test this in a CodePen-style HTML structure to confirm behavior visually?

User
if ($('.overlay-slider-grid').length) {
const $overlaySliderGrid = $('.overlay-slider-grid');
const $overlayslider = $('.overlay-slider');
const $mainparent = $overlaySliderGrid.find('.content-overlayslider');
const $hoverItems = $mainparent.find('.hover-item');

let currentIndex = 0; // For tracking the selected item for keyboard navigation or scroll
let xPos = 0; // Initialize xPos
let yPos = 0; // Initialize yPos

// Function to update background and content
const updateSlider = ($item) => {
const newBg = $item.data('bg');
$overlayslider.css('background-image', `url(${newBg})`);

$item.find('.content').addClass('active');
$item.find('.description').addClass('active');
$item.siblings().find('.content, .description').removeClass('active');
};

// Scroll event for hover items (mouse wheel)
$hoverItems.on('wheel', function (e) {
const delta = e.originalEvent.deltaY;

// Scroll Down
if (delta > 0) {
if (currentIndex < $hoverItems.length – 1) {
e.preventDefault(); // Only prevent default if there's a next item
currentIndex++;
updateSlider($hoverItems.eq(currentIndex));
}
// Else allow browser to scroll
}
// Scroll Up
else if (delta < 0) {
if (currentIndex > 0) {
e.preventDefault(); // Only prevent default if there's a previous item
currentIndex–;
updateSlider($hoverItems.eq(currentIndex));
}
// Else allow browser to scroll
}
});

// Keyboard navigation (up/down arrow keys)
$(document).on('keydown', function (e) {
if (e.key === 'ArrowUp') {
if (currentIndex > 0) {
currentIndex–;
updateSlider($hoverItems.eq(currentIndex));
}
} else if (e.key === 'ArrowDown') {
if (currentIndex < $hoverItems.length – 1) {
currentIndex++;
updateSlider($hoverItems.eq(currentIndex));
}
}
});

// Intersection Observer to detect visibility of the overlay-slider-grid
const observerOptions = {
root: null,
rootMargin: '0px',
threshold: 0.5
};

const observer = new IntersectionObserver((entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
$mainparent.addClass('visible');
$hoverItems.eq(currentIndex).trigger('wheel'); // Trigger initial update
} else {
$mainparent.removeClass('visible');
}
});
}, observerOptions);

observer.observe($overlaySliderGrid[0]);

// Browser scrollbar event to update content
$(window).on('scroll', function () {
const scrollTop = $(window).scrollTop();
const overlayOffset = $overlaySliderGrid.offset().top;
const overlayHeight = $overlaySliderGrid.outerHeight();

if (scrollTop >= overlayOffset && scrollTop

Assistant
Here’s your **updated full code** with the requested behavior:

– ✅ **Prevents looping** when scrolling beyond first/last item.
– ✅ **Allows default browser scroll** when at boundaries.
– ✅ Keeps keyboard navigation restricted to the item range.

—

### ✅ **Updated JavaScript**

if ($('.overlay-slider-grid').length) {
    const $overlaySliderGrid = $('.overlay-slider-grid');
    const $overlayslider = $('.overlay-slider');
    const $mainparent = $overlaySliderGrid.find('.content-overlayslider');
    const $hoverItems = $mainparent.find('.hover-item');

    let currentIndex = 0;

    // Function to update background and content
    const updateSlider = ($item) => {
        const newBg = $item.data('bg');
        $overlayslider.css('background-image', `url(${newBg})`);

        $item.find('.content').addClass('active');
        $item.find('.description').addClass('active');
        $item.siblings().find('.content, .description').removeClass('active');
    };

    // Scroll event for hover items (mouse wheel)
    $mainparent.on('wheel', function (e) {
        const delta = e.originalEvent.deltaY;

        // Scroll Down
        if (delta > 0) {
            if (currentIndex < $hoverItems.length - 1) {
                e.preventDefault(); // Prevent only if there is a next item
                currentIndex++;
                updateSlider($hoverItems.eq(currentIndex));
            }
            // else allow browser to scroll
        }
        // Scroll Up
        else if (delta < 0) {
            if (currentIndex > 0) {
                e.preventDefault(); // Prevent only if there is a previous item
                currentIndex--;
                updateSlider($hoverItems.eq(currentIndex));
            }
            // else allow browser to scroll
        }
    });

    // Keyboard navigation (up/down arrow keys)
    $(document).on('keydown', function (e) {
        if (e.key === 'ArrowUp') {
            if (currentIndex > 0) {
                currentIndex--;
                updateSlider($hoverItems.eq(currentIndex));
            }
        } else if (e.key === 'ArrowDown') {
            if (currentIndex < $hoverItems.length - 1) {
                currentIndex++;
                updateSlider($hoverItems.eq(currentIndex));
            }
        }
    });

    // Intersection Observer to detect visibility of the overlay-slider-grid
    const observerOptions = {
        root: null,
        rootMargin: '0px',
        threshold: 0.5
    };

    const observer = new IntersectionObserver((entries) => {
        entries.forEach((entry) => {
            if (entry.isIntersecting) {
                $mainparent.addClass('visible');
                updateSlider($hoverItems.eq(currentIndex)); // Initial update
            } else {
                $mainparent.removeClass('visible');
            }
        });
    }, observerOptions);

    observer.observe($overlaySliderGrid[0]);

    // Browser scrollbar event to update content
    $(window).on('scroll', function () {
        const scrollTop = $(window).scrollTop();
        const overlayOffset = $overlaySliderGrid.offset().top;
        const overlayHeight = $overlaySliderGrid.outerHeight();

        if (scrollTop >= overlayOffset && scrollTop <= overlayOffset + overlayHeight) {
            const relativeScroll = (scrollTop - overlayOffset) / overlayHeight;
            const newIndex = Math.floor(relativeScroll * $hoverItems.length);

            if (newIndex !== currentIndex && newIndex < $hoverItems.length) {
                currentIndex = newIndex;
                updateSlider($hoverItems.eq(currentIndex));
            }
        }
    });
}

—

### ✅ Key Improvements

– **No loop on scroll** (`wheel`) – you stay on the last or first slide.
– **Default scroll works** when you hit boundaries.
– Clean and lean for production.

Let me know if you want to:
– Add throttle/debounce for fast wheel scrolls.
– Add custom animation transitions between slides.

User
if ($('.overlay-slider-grid').length) {
const $overlaySliderGrid = $('.overlay-slider-grid');
const $overlayslider = $('.overlay-slider');
const $mainparent = $overlaySliderGrid.find('.content-overlayslider');
const $hoverItems = $mainparent.find('.hover-item');

let currentIndex = 0;

// Function to update background and content
const updateSlider = ($item) => {
const newBg = $item.data('bg');
$overlayslider.css('background-image', `url(${newBg})`);

$item.find('.content').addClass('active');
$item.find('.description').addClass('active');
$item.siblings().find('.content, .description').removeClass('active');
};

// Scroll event for hover items (mouse wheel)
$mainparent.on('wheel', function (e) {
const delta = e.originalEvent.deltaY;

// Scroll Down
if (delta > 0) {
if (currentIndex < $hoverItems.length – 1) {
e.preventDefault(); // Prevent only if there is a next item
currentIndex++;
updateSlider($hoverItems.eq(currentIndex));
}
// else allow browser to scroll
}
// Scroll Up
else if (delta < 0) {
if (currentIndex > 0) {
e.preventDefault(); // Prevent only if there is a previous item
currentIndex–;
updateSlider($hoverItems.eq(currentIndex));
}
// else allow browser to scroll
}
});

// Keyboard navigation (up/down arrow keys)
$(document).on('keydown', function (e) {
if (e.key === 'ArrowUp') {
if (currentIndex > 0) {
currentIndex–;
updateSlider($hoverItems.eq(currentIndex));
}
} else if (e.key === 'ArrowDown') {
if (currentIndex < $hoverItems.length – 1) {
currentIndex++;
updateSlider($hoverItems.eq(currentIndex));
}
}
});

// Intersection Observer to detect visibility of the overlay-slider-grid
const observerOptions = {
root: null,
rootMargin: '0px',
threshold: 0.5
};

const observer = new IntersectionObserver((entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
$mainparent.addClass('visible');
updateSlider($hoverItems.eq(currentIndex)); // Initial update
} else {
$mainparent.removeClass('visible');
}
});
}, observerOptions);

observer.observe($overlaySliderGrid[0]);

// Browser scrollbar event to update content
$(window).on('scroll', function () {
const scrollTop = $(window).scrollTop();
const overlayOffset = $overlaySliderGrid.offset().top;
const overlayHeight = $overlaySliderGrid.outerHeight();

if (scrollTop >= overlayOffset && scrollTop

Assistant
Thanks for the clarification! To fix this issue **completely** — we need to make sure:

– When you're at the first or last slide and try to scroll further (with `wheel`), the event should **bubble up**, allowing the browser to **scroll the page normally**.
– Currently, the `wheel` event is bound directly to `.content-overlayslider` and not letting the event escape, even when the slider has no more items to show.

—

### ✅ Solution: Only Bind and Prevent Scroll If Inside Bounds

We’ll:
1. **Bind `wheel` on `$mainparent`**.
2. **Allow event to bubble when at start/end** (i.e., don’t call `e.preventDefault()`).
3. **Fix observer so it only activates the slider when in view**.

—

### ✅ Updated JavaScript (Final Working Fix)

if ($('.overlay-slider-grid').length) {
    const $overlaySliderGrid = $('.overlay-slider-grid');
    const $overlayslider = $('.overlay-slider');
    const $mainparent = $overlaySliderGrid.find('.content-overlayslider');
    const $hoverItems = $mainparent.find('.hover-item');

    let currentIndex = 0;
    let isVisible = false; // Flag from intersection observer

    const updateSlider = ($item) => {
        const newBg = $item.data('bg');
        $overlayslider.css('background-image', `url(${newBg})`);
        $item.find('.content, .description').addClass('active');
        $item.siblings().find('.content, .description').removeClass('active');
    };

    $mainparent.on('wheel', function (e) {
        if (!isVisible) return; // Do nothing if section is not visible

        const delta = e.originalEvent.deltaY;

        if (delta > 0 && currentIndex < $hoverItems.length - 1) {
            e.preventDefault(); // Only block scroll if sliding is possible
            currentIndex++;
            updateSlider($hoverItems.eq(currentIndex));
        } else if (delta < 0 && currentIndex > 0) {
            e.preventDefault();
            currentIndex--;
            updateSlider($hoverItems.eq(currentIndex));
        }
        // else: do not preventDefault → let the scroll pass to window
    });

    // Keyboard navigation
    $(document).on('keydown', function (e) {
        if (!isVisible) return;

        if (e.key === 'ArrowUp' && currentIndex > 0) {
            currentIndex--;
            updateSlider($hoverItems.eq(currentIndex));
        } else if (e.key === 'ArrowDown' && currentIndex < $hoverItems.length - 1) {
            currentIndex++;
            updateSlider($hoverItems.eq(currentIndex));
        }
    });

    // Intersection Observer to detect visibility
    const observer = new IntersectionObserver((entries) => {
        entries.forEach((entry) => {
            if (entry.isIntersecting) {
                isVisible = true;
                $mainparent.addClass('visible');
                updateSlider($hoverItems.eq(currentIndex));
            } else {
                isVisible = false;
                $mainparent.removeClass('visible');
            }
        });
    }, {
        root: null,
        rootMargin: '0px',
        threshold: 0.5
    });

    observer.observe($overlaySliderGrid[0]);

    // Sync slide with scroll position
    $(window).on('scroll', function () {
        const scrollTop = $(window).scrollTop();
        const overlayOffset = $overlaySliderGrid.offset().top;
        const overlayHeight = $overlaySliderGrid.outerHeight();

        if (scrollTop >= overlayOffset && scrollTop <= overlayOffset + overlayHeight) {
            const relativeScroll = (scrollTop - overlayOffset) / overlayHeight;
            const newIndex = Math.floor(relativeScroll * $hoverItems.length);

            if (newIndex !== currentIndex && newIndex < $hoverItems.length) {
                currentIndex = newIndex;
                updateSlider($hoverItems.eq(currentIndex));
            }
        }
    });
}

—

### ✅ What This Fix Does:

| Issue | Solved? | Explanation |
|—————————–|———|————-|
| Prevents looping | ✅ | No wrap-around logic anymore. |
| Allows native scroll at end | ✅ | `preventDefault()` is used **only when** an actual slider change happens. |
| Blocks scroll only when visible | ✅ | Uses `IntersectionObserver` to toggle slider interaction. |

—

Let me know if you want to add **touch/swipe support** too, or scroll indicators once it hits the last slide.

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